take off the trim panel,remove the heater control panel screws and behind the heater control way in theres i believe a 10 mm bolt on one side,but you have to move the heater control panel to see the bolt,you will have to re-use the two side pieces from the factory radio to mount the new deck,BTW most aftermarket stereo trim panels dont fit around the face plate with the dash panel re-installed depending on the stereo